/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.sql.calcite.filtration;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;

public class MoveMarkerFiltersToIntervals implements Function<Filtration, Filtration>
{
  private static final MoveMarkerFiltersToIntervals INSTANCE = new MoveMarkerFiltersToIntervals();

  private MoveMarkerFiltersToIntervals()
  {
  }

  public static MoveMarkerFiltersToIntervals instance()
  {
    return INSTANCE;
  }

  @Override
  public Filtration apply(final Filtration filtration)
  {
    if (Filtration.matchEverything().equals(filtration.getDimFilter())) {
      return Filtration.create(null, filtration.getIntervals());
    } else if (Filtration.matchNothing().equals(filtration.getDimFilter())) {
      return Filtration.create(null, ImmutableList.of());
    } else {
      return filtration;
    }
  }
}
